The group, whose other members are Jeff Timmons, Justin Jeffre, and Nick's brother Drew Lachey, joined Nick onstage for a rendition of the classic "I'll Be Home for Christmas." In keeping with the show's tradition of honoring a capella singers, the group sang a capella live. They also looked natty in their matching Christmasy black suits and red ties.
Later, 40-year-old Nick duetted with judge Jewel on the standard "It Had To Be You."
98 Degrees isn't the only '90s guy group to reunite recently. The four other members of 'N Sync joined Justin Timberlake onstage at the Grammys for a performance, and 98D went on tour with New Kids on the Block and Boyz II Men. So can somebody get the Backstreet Boys back together soon, please?